Simple Two-User Website Chat

I need an embeddable chat box that sits on my website and allows a private, two-person conversation between me (manager) and a customer. No sign-up, password, or account creation should get in the way—when a customer clicks the chat icon or a direct link I email them, the window simply opens and we can start talking.

Core objectives
• Web-only integration (the platform choice I selected)
• One manager seat, one customer seat per session
• Real-time text exchange with automatic refresh or websockets so neither side has to reload the page
• Clean code I can drop into any page plus a brief setup note (where to paste the script, how to start a new session)

Optional niceties—if you already have them in your toolkit, feel free to include typing indicators or basic file sharing, but they’re not mandatory.

Please deliver the complete front-end snippet, any server-side files (Node.js, PHP or similar are all fine), and clear integration instructions so I can have the chat live on my site right away.

Another thing I prefer chat that works without WordPress and works on hosting or integrating code to chat with any template I have